28070239 has 4 divisors (see below), whose sum is σ = 29547640. Its totient is φ = 26592840.

The previous prime is 28070227. The next prime is 28070249. The reversal of 28070239 is 93207082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93207082 = 2 ⋅46603541.

It is a cyclic number.

It is not a de Polignac number, because 28070239 - 2¹⁷ = 27939167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28070239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28070219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738672 + ... + 738709.

It is an arithmetic number, because the mean of its divisors is an integer number (7386910).

Almost surely, 2^28070239 is an apocalyptic number.

28070239 is a deficient number, since it is larger than the sum of its proper divisors (1477401).

28070239 is a wasteful number, since it uses less digits than its factorization.

28070239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477400.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 28070239 is about 5298.1354267327. The cubic root of 28070239 is about 303.9125982292.

The spelling of 28070239 in words is "twenty-eight million, seventy thousand, two hundred thirty-nine".